The fire grew to at least 4,000 acres and spread quickly over six miles in length because it is a wind driven fire -- also making it very difficult to fight. It is burning near the Alameda-San Joaquin County border and near Corral Hollow Road.

Nearby, there is a Lawrence Livermore Lab testing facility and Carnegie State Park. There is also a home here or there, but nothing is in jeopardy.

At one point on Thursday evening, the winds were blowing the fire towards Tracy and Interstate 580, but was very far away from reaching anyone. The smoke is still blowing towards I-580 and the CHP is taking precautions to make sure visibility on the roads are safe. The interstate is open, but they closed the on-ramp at Corral Hollow temporally to monitor the situation.

The CHP also added that there might be more temporary closures, since it's easier to close it and assess the visibility rather than wait until it's too late.

No one has been hurt and no structures are threatened. It is just a very big wildfire and it's only 10 percent contained. 120 firefighters were on the line overnight and thousands are expected to arrive by Friday morning. It looks like they are going to be out there fighting the fire for at least two days.